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You might try making sure all permissions are enabled for the app. I know back when I was testing 9.0 the T-Mobile app had no permissions selected and requested no permissions so I had to manually toggle each permission.

That made it work for me on 9.0 in October. Of course during testing this might just be a bug. Perhaps you can check the internal Samsung testing community forum and see if there are other T-Mobile customers testing your same version and find out whether or not they have had a problem with the app.